Film capacitor, film, and metallized film

Patent metadata

Field	Value
Publication number	US-12424385-B2
Application number	US-202318295588-A
Country	US
Kind code	B2
Filing date	Apr 4, 2023
Priority date	Oct 9, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A film capacitor that includes: a wound body in which a dielectric film and a metal layer are wound, the dielectric film including a cured product of a first organic material having a hydroxy group and a second organic material that is an aromatic compound having an isocyanate group, the dielectric film including a first main surface and a second main surface opposed to each other in a thickness direction, the metal layer being disposed at least on the first main surface of the dielectric film. The first main surface of the dielectric film includes a plurality of protrusions having the second organic material. In an area range of 100 μm by 140 μm of the first main surface of the dielectric film, a skewness of the first main surface of the dielectric film is 0.782 to 14.3.

First claim

The invention claimed is:

1. A film capacitor comprising:
a wound body in which a dielectric film and a metal layer are wound, the dielectric film including a cured product of a first organic material having a hydroxy group and a second organic material that is an aromatic compound having an isocyanate group, the dielectric film including a first main surface and a second main surface opposed to each other in a thickness direction, the metal layer being disposed at least on the first main surface of the dielectric film,
wherein the first main surface of the dielectric film includes a plurality of protrusions having the second organic material, and
in an area range of 100 μm by 140 μm of the first main surface of the dielectric film, a skewness of the first main surface of the dielectric film is 0.782 to 14.3.

2. The film capacitor according to claim 1 , wherein a surface of the metal layer on an opposite side of the first main surface of the dielectric film includes a plurality of protruding parts coinciding with the plurality of the protrusions.

3. The film capacitor according to claim 2 , wherein in an area range of 100 μm by 140 μm of the surface of the metal layer, a skewness of the surface of the metal layer is 0.562 to 13.9.

4. The film capacitor according to claim 2 , wherein a coefficient of static friction on a side of the metal layer on the first main surface of the dielectric film is 1.4 or less.

5. The film capacitor according to claim 2 , wherein a coefficient of static friction on a side of the metal layer on the first main surface of the dielectric film is 0.2 to 1.4.

6. The film capacitor according to claim 1 , wherein the wound body has a flat cross section perpendicular to a scroll axis direction of the wound body.

7. A film capacitor comprising:
a wound body in which a dielectric film and a metal layer are wound, the dielectric film including a cured product of a first organic material having a hydroxy group and a second organic material that is an aromatic compound having an isocyanate group, the dielectric film including a first main surface and a second main surface opposed to each other in a thickness direction, the metal layer being disposed at least on the first main surface of the dielectric film,
wherein the first main surface of the dielectric film includes a plurality of protrusions having the second organic material,
a surface of the metal layer on an opposite side of the first main surface of the dielectric film includes a plurality of protruding parts coinciding with the plurality of the protrusions, and
in an area range of 100 μm by 140 μm of the surface of the metal layer, a skewness of the surface of the metal layer is 0.562 to 13.9.

8. The film capacitor according to claim 7 , wherein a coefficient of static friction on a side of the metal layer on the first main surface of the dielectric film is 1.4 or less.

9. The film capacitor according to claim 7 , wherein a coefficient of static friction on a side of the metal layer on the first main surface of the dielectric film is 0.2 to 1.4.

10. The film capacitor according to claim 7 , wherein the wound body has a flat cross section perpendicular to a scroll axis direction of the wound body.

11. A film comprising a cured product of a first organic material having a hydroxy group and a second organic material that is an aromatic compound having an isocyanate group, and including a first main surface and a second main surface opposed to each other in a thickness direction,
wherein the first main surface includes a plurality of protrusions having the second organic material, and
in an area range of 100 μm by 140 μm of the first main surface, a skewness of the first main surface is 0.782 to 14.3.

12. The film according to claim 11 , wherein a coefficient of static friction on the first main surface side is 1.0 or less.

13. The film according to claim 11 , wherein a coefficient of static friction on the first main surface side is 0.1 to 1.0.

14. A metallized film comprising:
a film including a cured product of a first organic material having a hydroxy group and a second organic material that is an aromatic compound having an isocyanate group, and including a first main surface and a second main surface opposed to each other in a thickness direction; and
a metal layer disposed at least on the first main surface of the film,
wherein the first main surface of the film includes a plurality of protrusions having the second organic material,
a surface of the metal layer on an opposite side of the first main surface of the film includes a plurality of protruding parts coinciding with the plurality of the protrusions, and
in an area range of 100 μm by 140 μm of the surface of the metal layer, a skewness of the surface of the metal layer is 0.562 to 13.9.

15. The metallized film according to claim 14 , wherein a coefficient of static friction on a side of the metal layer on the first main surface of the film is 1.4 or less.

16. The metallized film according to claim 14 , wherein a coefficient of static friction on a side of the metal layer on the first main surface of the dielectric film is 0.2 to 1.4.

Assignees

• Murata Manufacturing Co

Inventors

• Yamazaki Kazuto
• Inakura Tomoki

Classifications

• H01G4/32 Primary

  Wound capacitors · CPC title

• H01G4/012

  Form of non-self-supporting electrodes · CPC title

• H01G4/008

  Selection of materials · CPC title

• H01B17/56

  Insulating bodies · CPC title

• H01B5/14

  comprising conductive layers or films on insulating-supports · CPC title