Patent ID: 11972907
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A solid electrolytic capacitor comprising:
a resin molding including:
a laminate of multiple capacitor elements, each capacitor element of the multiple capacitor elements including:
an anode comprising a valve-action metal substrate including a core and a porous portion on a surface of the core;
a dielectric layer on a surface of the anode; and
a cathode opposite to the anode across the dielectric layer and including a cathode lead-out layer; and

a sealing resin sealing the laminate,
wherein the resin molding defines a bottom surface and a top surface opposite to each other in a thickness direction parallel to a lamination direction of the multiple capacitor elements, a first end surface and a second end surface opposite to each other in a length direction perpendicular to the lamination direction, and a first side surface and a second side surface opposite to each other in a width direction perpendicular to the lamination direction and the length direction;

a first external electrode on the first end surface of the resin molding and electrically connected to the valve-action metal substrate exposed at the first end surface; and
a second external electrode on the second end surface of the resin molding and electrically connected to the cathode lead-out layer exposed at the second end surface,
wherein the following are satisfied:
t1<t2,
t3<t4,
t1<t3, and
t4/t3<t2/t1,
where t1 is a thickness of an inner portion of the cathode lead-out layer, the inner portion not being exposed at the second end surface,
t2 is a thickness of an exposed portion of the cathode lead-out layer, the exposed portion being exposed at the second end surface,
t3 is a thickness of an inner portion of the valve-action metal substrate, the inner portion not being exposed at the first end surface, and
t4 is a thickness of an exposed portion of the valve-action metal substrate, the exposed portion being exposed at the first end surface.