Multilayer capacitor

Patent metadata

Field	Value
Publication number	US-12159755-B2
Application number	US-202217682460-A
Country	US
Kind code	B2
Filing date	Feb 28, 2022
Priority date	Mar 2, 2021
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

A multilayer capacitor includes an element body haying a pair of end surfaces, and a pair of side surfaces and a pair of main surfaces; and a pair of external electrodes. The element body includes an inner layer portion in which a plurality of internal electrodes and a plurality of dielectric layers are alternately stacked in a second direction where the pair of main surfaces face each other, and a pair of outer layer portions disposed outside the inner layer portion in the second direction. On at least one of the pair of end surfaces, the internal electrode of the inner layer portion protrudes outward in the first direction from the outer layer portion by a predetermined protrusion amount. A ratio of the protrusion amount to a dimension of one outer layer portion in the second direction ranges from 96,000 ppm to 176,000 ppm.

First claim

What is claimed is:

1. A multilayer capacitor comprising:
an element body having a pair of end surfaces facing each other, and a pair of side surfaces and a pair of main surfaces located between the pair of end surfaces to extend in a first direction where the pair of end surfaces face each other; and
a pair of external electrodes disposed on the pair of end surfaces,
wherein the element body includes an inner layer portion in which a plurality of internal electrodes and a plurality of dielectric layers are alternately stacked in a second direction where the pair of main surfaces face each other, and a pair of outer layer portions disposed outside the inner layer portion in the second direction, the pair of outer layer portions contacting the pair of external electrodes at the pair of end surfaces,
on at least one of the pair of end surfaces, the internal electrode of the inner layer portion protrudes outward in the first direction from the outer layer portion by a predetermined protrusion amount,
a ratio of the protrusion amount to a dimension of one outer layer portion in the second direction ranges from 121,000 ppm to 154,000 ppm, and
at least one outer layer portion of the pair of outer layer portions has a thickness in the second direction that ranges from 90 um to 200 um.

2. The multilayer capacitor according to claim 1 ,
wherein the ratio is 137,000 ppm or more.

3. The multilayer capacitor according to claim 1 ,
wherein the internal electrode includes a main electrode portion forming an electrostatic capacitance, and a connecting portion that connects the main electrode portion and the external electrode, and
a width dimension of the connecting portion is smaller than a width dimension of the main electrode portion in a third direction where the pair of side surfaces face each other.

4. The multilayer capacitor according to claim 1 , wherein, when viewed in a direction perpendicular to the second direction, the pair of outer layer portions are located inside the external electrodes in the second direction.

5. The multilayer capacitor according to claim 1 , wherein,
one main surface of the pair of main surfaces is partially covered by a first portion of one of the pair of external electrodes and a second portion of the other of the pair of external electrodes,
the first portion forming a first protrusion that protrudes from the main surface in the second direction,
the second portion forming a second protrusion that protrudes from the main surface in the second direction, and
when viewed in a third direction where the pair of side surfaces face each other, the first protrusion and the second protrusion form a space therebetween in the first direction, the space being entirely clear of the pair of outer layer portions.

6. The multilayer capacitor according to claim 1 , wherein a thickness of the element body in the second direction defined by the pair of outer layer portions is smaller than a dimension of the pair of external electrodes in the second direction.

7. The multilayer capacitor according to claim 1 , wherein at least one of the pair of main surfaces has portions that are covered by the external electrodes and portions that are exposed from the external electrodes, and the portions exposed from the external electrodes constitute a flat surface in a plane that extends in the first direction and the third direction.

8. The multilayer capacitor according to claim 1 , wherein the element body has a rectangular parallelepiped shape with chamfered corners, each corner having a round shape with a radius of curvature in a range of 50 to 200 μm.

Assignees

• Tdk Corp

Inventors

• Hirabayashi Hikaru
• Yoshida Daisuke
• Kimura Masato

Classifications

• H01G4/30 Primary

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• H01G4/248

  the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence) · CPC title

• H01G4/232

  electrically connecting two or more layers of a stacked or rolled capacitor · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G4/012

  Form of non-self-supporting electrodes · CPC title