Film capacitor, film, and metallized film

Patent metadata

Field	Value
Publication number	US-12217912-B2
Application number	US-202318295604-A
Country	US
Kind code	B2
Filing date	Apr 4, 2023
Priority date	Oct 9, 2020
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

Abstract

A film capacitor that includes a wound body having a dielectric film and a metal layer, 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 metal layer being disposed at least on a 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, the plurality of the protrusions have an average diameter of 0.58 μm to 5.98 μm and an average height of 0.11 μm to 2.54 μm, and a number of the plurality of the protrusions ranges from 50 to 450.

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, the plurality of the protrusions have an average diameter of 0.58 μm to 5.98 μm and an average height of 0.11 μm to 2.54 μm, and a number of the plurality of the protrusions ranges from 50 to 450.

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, the plurality of the protruding parts have an average diameter of 0.60 μm to 6.13 μm and an average height of 0.13 μm to 2.63 μm, and a number of the plurality of the protruding parts ranges from 50 to 450.

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. The film capacitor according to claim 1 , wherein a top face of the plurality of the protrusions is dented.

8. 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, the plurality of the protruding parts have an average diameter of 0.60 μm to 6.13 μm and an average height of 0.13 μm to 2.63 μm, and a number of the plurality of the protruding parts ranges from 50 to 450.

9. The film capacitor according to claim 8 , 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.

10. The film capacitor according to claim 8 , 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.

11. The film capacitor according to claim 8 , wherein the wound body has a flat cross section perpendicular to a scroll axis direction of the wound body.

12. 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, the plurality of the protrusions have an average diameter of 0.58 μm to 5.98 μm and an average height of 0.11 μm to 2.54 μm, and a number of the plurality of the protrusions ranges from 50 to 450.

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

14. The film according to claim 12 , wherein a coefficient of static friction on the first main surface side is 0.1 to 1.0.

15. 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, the plurality of the protruding parts have an average diameter of 0.60 μm to 6.13 μm and an average height of 0.13 μm to 2.63 μm, and a number of the plurality of the protruding parts ranges from 50 to 450.

16. The metallized film according to claim 15 , 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.

17. The metallized film according to claim 15 , 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

• H01B17/56

  Insulating bodies · CPC title

• H01B5/14

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

• H01B3/302

  Polyurethanes or polythiourethanes; Polyurea or polythiourea · CPC title