# US 2018/0025845 A1 · Multilayer ceramic capacitor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0025845 A1 - Document ID: US20180025845A1 - Status: Published application - Kind: A1 - Application number: 15/653,235 - Filed: 2017-07-18 - Published: 2018-01-25 - Earliest claimed: 2016-07-25 - Assignees: Taiyo Yuden Co., Ltd. - Applicants: Taiyo Yuden Co., Ltd. - Inventors: So SATO; Yoshiaki IIJIMA; Takashi SASAKI - Web page: https://patentgrep.com/patent/US20180025845A1 ## CPC - H01G 4/306: {made by thin film techniques} - H01G 2/103: {Sealings, e.g. for lead-in wires; Covers} - H01G 2/12: Protection against corrosion (H01G2/10 takes precedence) - H01G 4/008: Selection of materials - H01G 4/1209: {characterised by the ceramic dielectric material (H01G4/1272, H01G4/1281 take precedence)} - H01G 4/224: Housing; Encapsulation - H01G 4/232: electrically connecting two or more layers of a stacked or rolled capacitor - 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) ## Abstract In an embodiment, a multilayer ceramic capacitor 10 has supplementary dielectric layers 11d covering the spaces between two first base conductor films 11c on both height-direction faces of a capacitive element 11′, respectively, in such a way that clearances CL are left between the first base conductor films 11c and the supplementary dielectric layers 11d in the length direction. External electrodes 12, 13 each have a second base conductor film 12a, 13a and a surface conductor film 12b, 13b, and the wraparound locations 12b1, 13b1 of each surface conductor film 12b, 13b have insertion parts 12b2, 13b2 that fill in the clearances CL. The multilayer ceramic capacitor can mitigate deterioration in moisture resistance. ## Claims ### Claim 1 A multilayer ceramic capacitor comprising a capacitor body of roughly rectangular solid shape, as well as a pair of external electrodes provided on both ends of the capacitor body in a length direction, where the external electrodes each have wraparound parts that wrap around onto at least a one height-direction face of the capacitor body, wherein: the capacitor body has: (a1) a capacitive element of roughly rectangular solid shape; (a2) first base conductor films provided on both length-direction ends of at least one height-direction face of the capacitive element; and (a3) a supplementary dielectric layer covering the space between the first base conductor films on the at least one height-direction face of the capacitive element except that there is a clearance between each of the first base conductor films and the supplementary dielectric layer in the length direction; one of the external electrodes has: (b1) a second base conductor film attached to one length-direction face of the capacitive element and also to one length-direction edge of the first base conductor film present on the one length-direction side of the capacitor body; and (b2) a surface conductor film attached continuously to a surface of the second base conductor film and also to a surface of the first base conductor film, wherein the wraparound part is constituted by the first base conductor film and the surface conductor film attached to the first base conductor film at the wraparound location, and the surface conductor film has, at the wraparound location, an insertion part that fills in the clearance; and another of the external electrodes has: (c1) a second base conductor film attached to another length-direction face of the capacitive element and also to another length-direction edge of the first base conductor film present on the other length-direction side of the capacitor body; and (c2) a surface conductor film attached continuously to a surface of the second base conductor film and also to a surface of the first base conductor film, wherein the wraparound part is constituted by the first base conductor film and the surface conductor film attached to the first base conductor film at the wraparound location, and the surface conductor film has, at the wraparound location, an insertion part that fills in the clearance. ### Claim 2 (depends on 1) A multilayer ceramic capacitor according to claim 1, wherein a thickness of the supplementary dielectric layer is equal to or less than a thickness of the wraparound part of each of the external electrodes. ### Claim 3 (depends on 1) A multilayer ceramic capacitor according to claim 1, wherein a length of the first base conductor film is set in a range of one-sixth to three-sevenths a length of the multilayer ceramic capacitor. ### Claim 4 (depends on 2) A multilayer ceramic capacitor according to claim 2, wherein a length of the first base conductor film is set in a range of one-sixth to three-sevenths a length of the multilayer ceramic capacitor. ### Claim 5 (depends on 1) A multilayer ceramic capacitor according to claim 1, wherein respective lengths of the surface conductor films are equal to or greater than respective lengths of the clearances. ### Claim 6 (depends on 2) A multilayer ceramic capacitor according to claim 2, wherein respective lengths of the surface conductor films are equal to or greater than respective lengths of the clearances. ### Claim 7 (depends on 3) A multilayer ceramic capacitor according to claim 3, wherein respective lengths of the surface conductor films are equal to or greater than respective lengths of the clearances. ### Claim 8 (depends on 4) A multilayer ceramic capacitor according to claim 4, wherein respective lengths of the surface conductor films are equal to or greater than respective lengths of the clearances. ### Claim 9 (depends on 1) A multilayer ceramic capacitor according to claim 1, wherein the surface conductor films are constituted by a plating film. ### Claim 10 (depends on 2) A multilayer ceramic capacitor according to claim 2, wherein the surface conductor films are constituted by a plating film. ### Claim 11 (depends on 3) A multilayer ceramic capacitor according to claim 3, wherein the surface conductor films are constituted by a plating film. ### Claim 12 (depends on 5) A multilayer ceramic capacitor according to claim 5, wherein the surface conductor films are constituted by a plating film. ### Claim 13 (depends on 1) A multilayer ceramic capacitor according to claim 1, wherein the first base conductor films are provided on both height-direction faces of the capacitive element, and the external electrodes each have two wraparound parts that wrap around onto both height-direction faces of the capacitor body. ### Claim 14 (depends on 2) A multilayer ceramic capacitor according to claim 2, wherein the first base conductor films are provided on both height-direction faces of the capacitive element, and the external electrodes each have two wraparound parts that wrap around onto both height-direction faces of the capacitor body. ### Claim 15 (depends on 3) A multilayer ceramic capacitor according to claim 3, wherein the first base conductor films are provided on both height-direction faces of the capacitive element, and the external electrodes each have two wraparound parts that wrap around onto both height-direction faces of the capacitor body. ### Claim 16 (depends on 5) A multilayer ceramic capacitor according to claim 5, wherein the first base conductor films are provided on both height-direction faces of the capacitive element, and the external electrodes each have two wraparound parts that wrap around onto both height-direction faces of the capacitor body. ### Claim 17 (depends on 9) A multilayer ceramic capacitor according to claim 9, wherein the first base conductor films are provided on both height-direction faces of the capacitive element, and the external electrodes each have two wraparound parts that wrap around onto both height-direction faces of the capacitor body.