# US 12,217,912 B2 · Film capacitor, film, and metallized film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,912 B2 - Document ID: US12217912B2 - Status: Granted - Kind: B2 - Application number: 18/295,604 - Filed: 2023-04-04 - Published: 2023-09-21 - Granted: 2025-02-04 - Earliest claimed: 2020-10-09 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Kazuto Yamazaki; Tomoki Inakura - Web page: https://patentgrep.com/patent/US12217912B2 ## CPC - H01G 4/14: Organic dielectrics - H01B 5/14: comprising conductive layers or films on insulating-supports - H01B 17/56: Insulating bodies - H01G 4/012: Form of non-self-supporting electrodes - H01G 4/015: Special provisions for self-healing - H01G 4/18: of synthetic material, e.g. derivatives of cellulose (H01G4/16 takes precedence) - H01G 4/32: Wound capacitors - H01B 3/302: {Polyurethanes or polythiourethanes; Polyurea or polythiourea} - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 2) 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. ### Claim 6 (depends on 1) 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. ### Claim 7 (depends on 1) The film capacitor according to claim 1, wherein a top face of the plurality of the protrusions is dented. ### Claim 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. ### Claim 9 (depends on 8) 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. ### Claim 10 (depends on 8) 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. ### Claim 11 (depends on 8) 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. ### Claim 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. ### Claim 13 (depends on 12) The film according to claim 12, wherein a coefficient of static friction on the first main surface side is 1.0 or less. ### Claim 14 (depends on 12) The film according to claim 12, wherein a coefficient of static friction on the first main surface side is 0.1 to 1.0. ### Claim 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. ### Claim 16 (depends on 15) 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. ### Claim 17 (depends on 15) 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.