JP7312261B2 - Film capacitor - Google Patents

Description

The present invention relates to film capacitors.

A film capacitor is generally produced by winding or laminating a metallized film having a metal layer on the surface of a dielectric film, and forming a pair of external electrodes on both end surfaces of the film. The external electrodes are usually formed by metal spraying called metallikon.

Such a film capacitor has a structure in which it is housed in an exterior case and then sealed with a sealing resin such as epoxy resin, as described in Patent Document 1, for example.

JP 2004-146724 A

However, in conventional film capacitors, external electrodes may be damaged by stress when the sealing resin expands or contracts due to changes in ambient temperature. In particular, there is a problem that the external electrodes are easily damaged at the edge of the external electrodes, ie, the outer peripheral edge of the external electrodes, where the stress concentrates.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film capacitor in which external electrodes are less likely to be damaged.

The film capacitor of the present invention comprises a laminate in which a film containing a metallized film having a metal layer provided on at least one main surface of a dielectric film is laminated in the lamination direction, and A first external electrode and a second external electrode provided on both end faces of the laminate, wherein the first external electrode has a first portion and a second portion surrounded by the first portion and when projected in the stacking direction, the surface layer of the first portion of the first external electrode is closer to the second external electrode than the surface layer of the second portion of the first external electrode. in position.

According to the present invention, it is possible to provide a film capacitor whose external electrodes are less likely to be damaged.

FIG. 1 is a perspective view schematically showing one example of the film capacitor of the present invention. 2A is a cross-sectional view of the film capacitor shown in FIG. 1 along line IIa-IIa, and FIG. 2B is an enlarged cross-sectional view of the IIb portion of FIG. 2A. 3A is a cross-sectional view of the film capacitor shown in FIGS. 1 and 2A taken along line IIIa-IIIa, and FIG. 3B is an enlarged cross-sectional view of the IIIb portion of FIG. 3A. FIG. 4 is a perspective view schematically showing an example of the lamination state of metallized films included in the laminate constituting the film capacitor shown in FIG. FIG. 5 is a perspective view schematically showing an example of a wound state of a laminate constituting the film capacitor shown in FIG. 1. FIG. 6A and 6B are perspective views schematically showing an example of how to use the film capacitor shown in FIG. 1. FIG. FIG. 7 is a perspective view schematically showing an example of a method of forming external electrodes. FIG. 8 is a cross-sectional view schematically showing an example of a method of forming steps in the first external electrode. FIG. 9 is a cross-sectional view schematically showing an example of a method of forming a metal portion connected to the first external electrode 11. As shown in FIG.

The film capacitor of the present invention will be described below. It should be noted that the present invention is not limited to the following configurations, and may be modified as appropriate without departing from the gist of the present invention. The present invention also includes a combination of a plurality of individual preferred configurations described below.

[Film capacitor]
As an example of the film capacitor of the present invention, a so-called wound film capacitor in which a dielectric film and a metal layer are laminated and wound is described below. The film capacitor of the present invention may be a so-called laminated film capacitor in which dielectric films and metal layers are alternately laminated.

FIG. 1 is a perspective view schematically showing one example of the film capacitor of the present invention. 2A is a cross-sectional view of the film capacitor shown in FIG. 1 along line IIa-IIa, and FIG. 2B is an enlarged cross-sectional view of the IIb portion of FIG. 2A. 3A is a cross-sectional view of the film capacitor shown in FIGS. 1 and 2A taken along line IIIa-IIIa, and FIG. 3B is an enlarged cross-sectional view of the IIIb portion of FIG. 3A.

In this specification, the stacking direction and width direction of the film capacitor are defined by arrows T and W, respectively, as shown in FIGS. 1, 2A, 2B, 3A and 3B. Although it can be said that there are a plurality of lamination directions in a wound type film capacitor, the direction defined by the arrow T is used in this specification. Here, the stacking direction T and the width direction W are orthogonal to each other.

A film capacitor 1 shown in FIG. and a second external electrode 12 provided on.

As shown in FIGS. 2A, 2B, 3A and 3B, the laminate 10 is wound with the first metallized film 21 and the second metallized film 22 laminated in the lamination direction T. It is a so-called wound body. The film capacitor 1 is a wound type film capacitor provided with the laminated body 10 which is also such a wound body.

In the film capacitor 1, from the viewpoint of reducing the height of the film capacitor 1, as shown in FIGS. The cross-sectional shape of is preferably a shape with a smaller thickness than when the cross-sectional shape is a perfect circle.

FIG. 4 is a perspective view schematically showing an example of the lamination state of metallized films included in the laminate constituting the film capacitor shown in FIG.

The first metallized film 21 is obtained by providing a first metal layer 41 on one main surface of the first dielectric film 31 .

The first metal layer 41 is provided so as to reach one side edge of the first metallized film 21 and not reach the other side edge of the first metallized film 21 in the width direction.

The second metallized film 22 is obtained by providing a second metal layer 42 on one main surface of the second dielectric film 32 .

The second metal layer 42 is provided so as to reach the other side edge of the second metallized film 22 without reaching one side edge of the second metallized film 22 in the width direction.

As shown in FIG. 4, the first metallized film 21 and the second metallized film 22 are laminated while being shifted in the width direction as indicated by double arrows Y1 and Y2. At this time, the main surfaces of the first metallized film 21 and the second metallized film 22 on which the first metal layer 41 and the second metal layer 42 are provided face the same direction (upward in FIG. 4). It is laminated in a state of

FIG. 5 is a perspective view schematically showing an example of a wound state of a laminate constituting the film capacitor shown in FIG. 1. FIG.
First, the first metallized film 21 and the second metallized film 22 laminated in the state shown in FIG. 4 are first wound around the pre-winding film 23 in a roll shape as shown in FIG. be. In FIG. 5, the second metallized film 22 is inside the first metallized film 21, the first metal layer 41 is inside the first dielectric film 31, and the second metal layer 42 is the second metallized film. The first metallized film 21 and the second metallized film 22 are laminated and wound so as to be inside the dielectric film 32 .

A protective winding film 24 for protecting the first metallized film 21 and the second metallized film 22 is overlapped and connected to the winding end portion of the second metallized film 22, A protective roll film 24 is wound a plurality of times around the outer peripheral surface of the winding end portion of the laminate 10 . The protective roll film 24 is fixed, for example, by thermal welding using heat sealing or the like.

As shown in FIGS. 2A and 3A, the laminate 10 is configured by winding a first metallized film 21 and a second metallized film 22 around a first wound film 23 in multiple layers. As shown in FIG. 2B, a capacitor is constructed by sandwiching a first dielectric film 31 or a second dielectric film 32 between a pair of first metal layers 41 and second metal layers 42 .

4 and 5, the second metal layer 42 is provided not on one main surface of the second dielectric film 32 but on the other main surface of the first dielectric film 31. may have been In this case, in the laminate 10, the first metal layer 41 is provided on one main surface of the first dielectric film 31, and the second metal layer 42 is provided on the other main surface. The metallized film and the second dielectric film 32 are laminated and wound.

The first external electrode 11 is provided on one end surface of the laminate 10 and is connected to the first metal layer 41 by contacting the exposed end of the first metal layer 41 .

The second external electrode 12 is provided on the other end surface of the laminate 10 and is connected to the second metal layer 42 by contacting the exposed end of the second metal layer 42 .

Examples of materials constituting the first external electrode 11 and the second external electrode 12 include metals such as zinc, aluminum, tin, and zinc-aluminum alloy. At least the portion of the first external electrode 11 that is connected to the first metal layer 41 is preferably made of a zinc-aluminum alloy. At least the portion of the second external electrode 12 that is connected to the second metal layer 42 is preferably made of a zinc-aluminum alloy. The first external electrode 11 and the second external electrode 12 are preferably formed by thermally spraying the metal on one end surface and the other end surface of the laminate 10, respectively.

The first external electrode 11, as shown in FIG. 1, has a first portion 11a and a second portion 11b surrounded by the first portion 11a. As shown in FIGS. 3A and 3B, when projected in the stacking direction T, the surface layer of the first portion 11a of the first external electrode 11 is second from the surface layer of the second portion 11b of the first external electrode 11. It is located near the external electrode 12 . Therefore, a step 13 recessed toward the second external electrode 12 is provided at the outer peripheral end of the first external electrode 11 .

Similarly, the second external electrode 12 has a first portion 12a and a second portion 12b surrounded by the first portion 12a, as shown in FIG. As shown in FIG. 3A , when projected in the stacking direction T, the surface layer of the first portion 12 a of the second external electrode 12 is higher than the surface layer of the second portion 12 b of the second external electrode 12 . located close to Therefore, a step 13 recessed toward the first external electrode 11 is provided at the outer peripheral edge of the second external electrode 12 .

If the step 13 is provided at the outer peripheral end of the first external electrode 11 or the second external electrode 12, the first external electrode 11 or the first external electrode 11 or the second external electrode 12 may be prevented from expanding or contracting when the sealing resin expands or contracts due to a change in ambient temperature. Since the stress concentrated on the outer peripheral edge of the second external electrode 12 is dispersed, the stress applied to the outer peripheral edge of the first external electrode 11 or the second external electrode 12 can be relieved. As a result, the first external electrode 11 or the second external electrode 12 is less likely to be damaged.

At least one of the first external electrode 11 and the second external electrode 12 should have the first portions 11a, 12a and the second portions 11b, 12b. That is, it is sufficient that the step 13 is provided at the outer peripheral edge of at least one of the first external electrode 11 and the second external electrode 12 . Further, the step 13 is preferably provided along the entire circumference of the outer peripheral edge of the first external electrode 11 or the second external electrode 12, but may be provided along a portion of the outer peripheral edge.

The shape of the step 13 is not particularly limited, and the step 13 may be rounded as shown in FIG. 3B. The shape of the step 13 may be constant at the outer peripheral edge of the first external electrode 11 or the second external electrode 12, or may differ from place to place. Also, the number of steps of the steps 13 is not particularly limited.

As shown in FIGS. 3A and 3B, when the first external electrode 11 has the first portion 11a and the second portion 11b, the end face of the laminate 10 on the side of the first external electrode 11 is the most It is preferable that the outer edge of the film is recessed toward the second external electrode 12 . Further, as shown in FIG. 3A, when the second external electrode 12 has the first portion 12a and the second portion 12b, the end face of the laminate 10 on the side of the second external electrode 12 is the outermost portion of the laminate 10. It is preferable that the end portion of the film located at the position is recessed toward the first external electrode 11 .

When the first external electrode 11 is formed by thermal spraying, by providing a dent in the edge of the film located on the outermost side of the laminate 10, the first external electrode 11 having the first portion 11a and the second portion 11b can be formed. can be formed, a step 13 can be formed at the outer peripheral end of the first external electrode 11 . Similarly, when the second external electrode 12 is formed by thermal spraying, by providing a dent in the edge of the film located on the outermost side of the laminate 10, a second electrode having a first portion 12a and a second portion 12b is formed. Since the external electrode 12 can be formed, the step 13 can be formed at the outer peripheral edge of the second external electrode 12 .

In particular, the outermost film of the laminate 10 is preferably the protective roll film 24 . The width of the protective roll film 24 may be the same as the width of the first dielectric film 31 and the second dielectric film 32, or may be the same as the width of the first dielectric film 31 and the second dielectric film 32. It can be shorter than the width. Even if the width of the protective roll film 24 is the same as the width of the first dielectric film 31 and the second dielectric film 32, the first dielectric film 31 and the second dielectric film 32 are wide in the width direction. Since the layers are laminated with a shift, a dent is formed at the end of the protective roll film 24 . Therefore, when forming the first external electrode 11 and the second external electrode 12 by thermal spraying, the step 13 can be formed at the outer peripheral edge of the first external electrode 11 or the second external electrode 12 .

When the outermost film of the laminate 10 is the protective roll film 24, as shown in FIGS. 3A and 3B, the ends of the first dielectric film 31 and the ends of the second dielectric film 32 It is preferable that the edge of the protective roll film 24 is arranged between the .

As shown in FIGS. 3A and 3B, the metal part 14 may be connected to the first external electrode 11 when the first external electrode 11 has the first portion 11a and the second portion 11b. When projected in the width direction W, the metal portion 14 is provided at a position overlapping the first portion 11 a of the first external electrode 11 . That is, the metal part 14 is provided so as to cover the step 13 . In addition, as shown in FIG. 3A, when the second external electrode 12 has a first portion 12a and a second portion 12b, the metal portion 14 may be connected to the second external electrode 12 . When projected in the width direction W, the metal portion 14 is provided at a position overlapping the first portion 12 a of the second external electrode 12 . That is, the metal part 14 is provided so as to cover the step 13 .

The metal part 14 is weakly connected to the first external electrode 11 or the second external electrode 12 by an anchor effect. The metal part 14 preferably has a lower density than the first external electrode 11 or the second external electrode 12 .

When the metal part 14 is connected to the first external electrode 11 or the second external electrode 12 so as to cover the step 13, the film capacitor 1 is housed in the exterior case and sealed with sealing resin. , the stress applied to the joint portion between the first metallized film 21 and the first external electrode 11 or the joint portion between the second metallized film 22 and the second external electrode 12 can be relaxed. . The reason will be explained with reference to FIGS. 6A and 6B below.

6A and 6B are perspective views schematically showing an example of how to use the film capacitor shown in FIG. 1. FIG.
As shown in FIG. 6A, first, the film capacitor 1 is housed in the exterior case 50 . A first lead terminal 51 is electrically connected to the first external electrode 11 , and a second lead terminal 52 is electrically connected to the second external electrode 12 . Next, as shown in FIG. 6B , by filling the interior of the exterior case 50 with a sealing resin 53 , the periphery of the film capacitor 1 is covered with the sealing resin 53 and the opening of the exterior case 50 is sealed. . The first lead terminal 51 and the second lead terminal 52 protrude from the inside of the exterior case 50 toward the outside.

In general, when a film capacitor housed in an outer case and sealed with a sealing resin is exposed to a sudden change in external temperature, the outer case and the sealing resin are more likely to lose heat compared to the internal laminate and external electrodes. temperature changes first. Therefore, when the external temperature changes, the external case and the sealing resin expand or contract first. As a result, the external electrodes receive compressive stress or tensile stress from the sealing resin, and there is a risk that the joints between the metallized film and the external electrodes will peel off. On the other hand, if the metal portion 14 is connected to the first external electrode 11 or the second external electrode 12 so as to cover the step 13, instead of the first external electrode 11 or the second external electrode 12, The metal portion 14 receives compressive stress or tensile stress from the sealing resin 53 and is destroyed. Therefore, the stress applied to the joint portion between the first metallized film 21 and the first external electrode 11 or the joint portion between the second metallized film 22 and the second external electrode 12 can be relaxed. . As a result, peeling of the joint portion is less likely to occur.

When the film capacitor 1 has a flat shape, the metal portion 14 preferably exists on the flat surface. In this case, the metal portion 14 may exist on the entire flat surface or may exist on a part of the flat surface.

The shape of the metal part 14 is not particularly limited, and may or may not protrude from the first external electrode 11 or the second external electrode 12 . The shape of the metal portion 14 may be constant at the outer peripheral edge of the first external electrode 11 or the second external electrode 12, or may differ from place to place.

As will be described later, the metal portion 14 can be formed by thermal spraying the metal that constitutes the first external electrode 11 and the second external electrode 12 . In that case, the metal part 14 is made of the same metal as the first external electrode 11 and the second external electrode 12 .

The first dielectric film 31 constituting the first metallized film 21 and the second dielectric film 32 constituting the second metallized film 22 each contain a curable resin as a main component. is preferred. Here, the main component means a component with the highest weight percentage, preferably a component with a weight percentage greater than 50% by weight.

The curable resin may be a thermosetting resin or a photocurable resin. A thermosetting resin means a resin that can be cured by heat, and the curing method is not limited. Therefore, thermosetting resins include resins cured by methods other than heat (for example, light, electron beams, etc.) as long as they are resins that can be cured by heat. In addition, depending on the material, the reactivity of the material itself may initiate a reaction, and a material that cures without necessarily applying heat or light from the outside is also defined as a thermosetting resin. The same applies to the photocurable resin, and the curing method is not limited as long as it is a resin that can be cured by light.

The curable resin may have at least one of a urethane bond and a urea bond, or may not have both a urethane bond and a urea bond. The presence of urethane bonds and/or urea bonds can be confirmed using a Fourier transform infrared spectrophotometer (FT-IR).

The curable resin is preferably composed of a cured product of the first organic material and the second organic material. Examples of such a cured product include a cured product obtained by reacting a hydroxyl group (OH group) of the first organic material and an isocyanate group (NCO group) of the second organic material. When a cured product is obtained by such a reaction, uncured portions of the starting material may remain in the dielectric film. For example, the first dielectric film 31 and the second dielectric film 32 may each contain at least one of hydroxyl groups and isocyanate groups. In this case, the first dielectric film 31 and the second dielectric film 32 may each contain one of hydroxyl groups and isocyanate groups, or may contain both hydroxyl groups and isocyanate groups. . The presence of hydroxyl groups and/or isocyanate groups can be confirmed using a Fourier transform infrared spectrophotometer (FT-IR).

The first organic material is preferably a polyol having multiple hydroxyl groups in its molecule. Examples of polyols include polyvinyl acetals such as polyvinyl acetoacetal, polyether polyols such as phenoxy resins, and polyester polyols. A plurality of types of organic materials may be used together as the first organic material.

The second organic material is preferably an isocyanate compound, an epoxy resin, or a melamine resin having multiple functional groups in its molecule. A plurality of types of organic materials may be used together as the second organic material.

Examples of isocyanate compounds include aromatic polyisocyanates such as diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI), and aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI). The isocyanate compounds may be modified polyisocyanates such as those containing carbodiimide or urethane.

The epoxy resin is not particularly limited as long as it has an epoxy ring, and examples thereof include bisphenol A type epoxy resin, biphenyl skeleton epoxy resin, cyclopentadiene skeleton epoxy resin, naphthalene skeleton epoxy resin, and the like.

The melamine resin is not particularly limited as long as it is an organic nitrogen compound having a triazine ring in the center of the structure and three amino groups around it, and examples thereof include alkylated melamine resins. The melamine resin may be a modified melamine.

The first dielectric film 31 and the second dielectric film 32 are preferably formed by molding a resin solution containing the first organic material and the second organic material into a film, followed by heat treatment to cure the film. is made.

Each of the first dielectric film 31 and the second dielectric film 32 may contain a deposited polymer film as a main component. The vapor-deposited polymer film may have at least one of urethane bonds and urea bonds, and may not have both urethane bonds and urea bonds. In addition, a vapor deposition polymer film refers to a film formed by a vapor deposition polymerization method, and is basically included in a curable resin.

Each of the first dielectric film 31 and the second dielectric film 32 may contain a thermoplastic resin as a main component. Examples of thermoplastic resins include polypropylene, polyethersulfone, polyetherimide, and polyarylate.

Each of the first dielectric film 31 and the second dielectric film 32 includes, as a component other than the main component, an uncured portion of a starting material such as a silicone resin, a first organic material, and a second organic material. etc. may be contained.

Each of the first dielectric film 31 and the second dielectric film 32 may contain additives for adding various functions. Examples of additives include leveling agents for imparting smoothness. The additive preferably has a functional group that reacts with a hydroxyl group and/or an isocyanate group and forms a part of the crosslinked structure of the cured product. Examples of such additives include resins having at least one functional group selected from the group consisting of hydroxyl groups, epoxy groups, silanol groups, and carboxyl groups.

The compositions of the first dielectric film 31 and the second dielectric film 32 may be different from each other, but are preferably the same.

Each of the first dielectric film 31 and the second dielectric film 32 preferably has a thickness of 0.5 μm or more and 5 μm or less. The thicknesses of the first dielectric film 31 and the second dielectric film 32 may be different from each other, but are preferably the same.

The thicknesses of the first dielectric film 31 and the second dielectric film 32 can be measured using an optical thickness meter.

Examples of materials for forming the first metal layer 41 forming the first metallized film 21 and the second metal layer 42 forming the second metallized film 22 include aluminum, zinc, and titanium. , magnesium, tin, and nickel.

The compositions of the first metal layer 41 and the second metal layer 42 may be different from each other, but are preferably the same.

Each of the first metal layer 41 and the second metal layer 42 preferably has a thickness of 5 nm or more and 40 nm or less.

The thickness of the first metal layer 41 can be specified by observing a cross section of the first metallized film 21 in the thickness direction using a transmission electron microscope (TEM). The thickness of the second metal layer 42 can be similarly specified.

The constituent material of the first film 23 is not particularly limited as long as the first metallized film 21 and the second metallized film 22 can be easily wound. phthalates and the like.

The first roll film 23 may be composed of an independent film separate from the first dielectric film 31 or the second dielectric film 32, or may be composed of a continuous series of films. If the film is composed of a continuous series of films, the electrode may not be provided in the portion corresponding to the first film 23 .

The constituent material of the protective roll film 24 is not particularly limited as long as it can protect the first metallized film 21 and the second metallized film 22. Examples thereof include polypropylene, polyethylene terephthalate, polyphenylene sulfide, and polyethylene naphthalate. etc.

The protective roll film 24 may consist of an independent film separate from the first dielectric film 31 or the second dielectric film 32, or may consist of a continuous series of films. If it is composed of a continuous series of films, the electrode may not be provided in the portion corresponding to the protective roll film 24 .

The configuration of laminate 10 may differ from that shown in FIGS. 3A and 3B. For example, in the first metallized film 21, the first metal layer 41 is divided into two metal layers in the width direction, one metal layer reaches one side edge of the first metallized film 21, and the other The metal layer is provided so as to reach the other side edge of the first metallized film 21, and the second metal layer 42 does not reach the one side edge of the second metallized film 22 and the other side edge. It may be provided so as not to reach the edge. Thus, in the first metal layer 41, one metal layer is connected to the first external electrode 11 and the other metal layer is connected to the second external electrode 12, while the second metal layer A capacitor can be constructed between the first metal layer 41 and the second metal layer 42 even when the capacitor 42 is provided so as not to be connected to both the first external electrode 11 and the second external electrode 12 .

[Manufacturing method of film capacitor]
A film capacitor of the present invention is manufactured, for example, by the following method.

First, as shown in FIG. 4, a first metallized film 21 and a second metallized film 22 are produced. Next, as shown in FIG. 5, the first metallized film 21 and the second metallized film 22 are wound in rolls around the first film 23 . After that, the protective roll film 24 is wound a plurality of times around the outer peripheral surface of the winding end portion.

It is preferable to sandwich the laminate 10 thus obtained from above and below and press it into a flat shape as shown in FIG. 2A.

A first external electrode 11 is formed on one end face of the laminate 10 by spraying metal so as to be connected to the first metal layer 41 . Also, the second external electrode 12 is formed on the other end surface of the laminate 10 so as to be connected to the second metal layer 42 by spraying metal.

FIG. 7 is a perspective view schematically showing an example of a method of forming external electrodes.
As shown in FIG. 7, the flat surface of the laminate 10 is sandwiched between thermal spray jigs 61 and 62 so that the end faces of the laminate 10 are open. The thermal spraying jigs 61 and 62 are not in contact with the corner surfaces of the laminate 10 . In the state shown in FIG. 7, the molten metal is sprayed from the thermal spray nozzle 63 onto the end surface of the laminate 10 .

FIG. 8 is a cross-sectional view schematically showing an example of a method of forming steps in the first external electrode.
When the thermal spraying nozzle 63 is moved in the direction of the double arrow shown in FIG. is recessed, a first external electrode 11 having a first portion 11a and a second portion 11b is formed. As a result, a step 13 is formed at the outer peripheral edge of the first external electrode 11 . The same is true for the edge of the film near the thermal spray jig 62 .

FIG. 9 is a cross-sectional view schematically showing an example of a method of forming a metal portion connected to the first external electrode 11. As shown in FIG.
If necessary, the molten metal may be sprayed only to the outside of the laminate with the thermal spray nozzle 63 separated from the laminate 10 as compared to the state shown in FIG. In that case, the metal portion 14 having a lower density than the first external electrode 11 can be formed on the step 13 . Note that the method of forming the metal portion 14 is not limited to the method shown in FIG.

For the second external electrode 12 as well, the step 13 and the metal portion 14 can be formed by the same method as described above.

As described above, the film capacitor 1 shown in FIG. 1 is manufactured.

The film capacitor of the present invention is not limited to the above-described embodiments, and various applications and modifications can be made within the scope of the present invention regarding the configuration of the film capacitor, manufacturing conditions, and the like.

1 film capacitor 10 laminate 11 first external electrode 11a first portion of first external electrode 11b second portion of first external electrode 12 second external electrode 12a first portion of second external electrode 12b second Second portion of external electrode 2 13 Step 14 Metal part 21 First metallized film 22 Second metallized film 23 First winding film 24 Protective winding film 31 First dielectric film 32 Second dielectric film 41 First metal layer 42 Second metal layer 50 Exterior case 51 First lead terminal 52 Second lead terminal 53 Sealing resin 61, 62 Thermal spraying jig 63 Thermal spraying nozzle

Claims (7)

a laminate in which films including a metallized film having a metal layer provided on at least one main surface of a dielectric film are laminated in the lamination direction;
a first external electrode and a second external electrode provided on both end surfaces of the laminate in the width direction orthogonal to the lamination direction;
and a metal portion connected to the first external electrode,
The first external electrode has a first portion and a second portion surrounded by the first portion,
When projected in the stacking direction, the surface layer of the first portion of the first external electrode is closer to the second external electrode than the surface layer of the second portion of the first external electrode,
At the end surface of the laminate on the side of the first external electrode, the edge of the film located on the outermost side of the laminate is recessed toward the second external electrode, thereby There is a step on the outer edge of the
the first portion is present in a recessed portion of the first external electrode along the recess of the film edge, and the second portion is present in a non-recessed portion of the first external electrode;
A film capacitor , wherein the metal part is provided so as to cover the step along the recess of the film edge. 2. The film capacitor according to claim 1, wherein said metal portion eliminates said step along said recess of said film edge . 3. The film capacitor according to claim 1 , wherein said metal portion has a lower density than said first external electrode. 4. The film capacitor according to claim 1, wherein the outermost film of said laminate is a protective roll film for protecting said metallized film. As the dielectric film, a first dielectric film and a second dielectric film are laminated in the lamination direction,
5. An edge of the protective roll film is arranged between an edge of the first dielectric film and an edge of the second dielectric film when projected in the stacking direction. The film capacitor described in . 6. The film capacitor according to claim 1, wherein at least a portion of said first external electrode connected to said metal layer is made of a zinc-aluminum alloy. the second external electrode has a first portion and a second portion surrounded by the first portion;
When projected in the stacking direction, the surface layer of the first portion of the second external electrode is closer to the first external electrode than the surface layer of the second portion of the second external electrode. The film capacitor according to any one of items 1 to 6.

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