US 12,406,812 B2
Film capacitor
Akira Okumura, Nagaokakyo (JP); and Tomoki Inakura, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Dec. 27, 2023, as Appl. No. 18/397,062.
Application 18/397,062 is a continuation of application No. PCT/JP2022/025104, filed on Jun. 23, 2022.
Claims priority of application No. 2021-114313 (JP), filed on Jul. 9, 2021.
Prior Publication US 2024/0170224 A1, May 23, 2024
Int. Cl. H01G 4/33 (2006.01); H01G 4/232 (2006.01)
CPC H01G 4/33 (2013.01) [H01G 4/232 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A film capacitor comprising:
a capacitor element that includes:
a laminate having a first end surface and a second end surface opposite to each other in a width direction;
a first external electrode connected to the first end surface of the laminate; and
a second external electrode connected to the second end surface of the laminate,
wherein the laminate includes:
a first dielectric film having a first main surface and a second main surface opposite to each other in a thickness direction perpendicular to the width direction;
a second dielectric film having a third main surface and a fourth main surface opposite to each other in the thickness direction;
a first metal layer connected to the first external electrode; and
a second metal layer connected to the second external electrode, wherein
the second main surface of the first dielectric film is opposite to the third main surface of the second dielectric film in the thickness direction,
the first dielectric film protrudes toward the first external electrode with respect to the second dielectric film,
when a protruding length of the first dielectric film with respect to the second dielectric film in the width direction is defined as a first protruding width, the first protruding width is larger at an outer peripheral portion of the laminate in the thickness direction than at a central portion of the laminate in the thickness direction, and the first protruding width at the outer peripheral portion of the laminate increases toward an outermost periphery of the laminate in the thickness direction,
the second dielectric film protrudes toward the second external electrode with respect to the first dielectric film, and
when a protruding length of the second dielectric film with respect to the first dielectric film in the width direction is defined as a second protruding width, the second protruding width is larger at the outer peripheral portion of the laminate in the thickness direction than at the central portion of the laminate in the thickness direction, and the second protruding width at the outer peripheral portion of the laminate increases toward the outermost periphery of the laminate in the thickness direction.