Capacitor

Patent metadata

Field	Value
Publication number	US-2018114640-A1
Application number	US-201715849815-A
Country	US
Kind code	A1
Filing date	Dec 21, 2017
Priority date	Aug 7, 2015
Publication date	Apr 26, 2018
Grant date	—

Abstract

A capacitor having an element main body including a metal high specific surface area substrate which has fine pores formed therein and has a large specific surface area; a dielectric layer in a prescribed region on the surface of the high specific surface area substrate including the inner surfaces of the pores; and a conductive part on the dielectric layer. A first terminal electrode is electrically connected to the high specific surface area substrate. A second terminal electrode is electrically connected to the conductive part. The element main body includes a first region that contributes to the acquisition of the capacitance and second regions having a smaller void ratio than the first region. The second regions have a void ratio of 25% or less.

First claim

1 . A capacitor comprising:
an element main body made of an electrical conductive material, the element main body having a first region with a plurality of pores therein and has a first void ratio, the first region principally contributing to the acquisition of a capacitance, and a second region having a second void ratio smaller than the first void ratio of the first region, the second void ratio being 25% or less; a dielectric layer in a prescribed region of a surface of the element main body including inner surfaces of the plurality of pores; a conductive part on the dielectric layer; a first terminal electrode electrically connected to the element main body; and a second terminal electrode electrically connected to the conductive part and electrically insulated from the first terminal electrode.

2 . The capacitor according to claim 1 , wherein the first void ratio of the first region is 30 to 80%.

3 . The capacitor according to claim 1 , wherein the first void ratio of the first region is 35 to 65%.

4 . The capacitor according to claim 1 , wherein the element main body includes two second regions provided at respective opposed ends of the first region.

5 . The capacitor according to claim 4 , further comprising a third second region interposed in the first region between the two second regions and in parallel to an end surface of the element main body.

6 . The capacitor according to claim 4 , further comprising a third second region interposed in the first region, and the third second region is connected to each of the two second regions.

7 . The capacitor according to claim 6 , wherein the third second region extends along at least one principal surface of the first region.

8 . The capacitor according to claim 1 , wherein the second region surrounds the first region.

9 . The capacitor according to claim 1 , wherein the dielectric layer is interposed between the conductive part and the element main body, and the element main body and the second terminal electrode are electrically insulated from each other.

10 . The capacitor according to claim 1 , wherein the dielectric layer is formed by being deposited in increments of an atomic layer.

11 . The capacitor according to claim 1 , wherein the conductive part extends into the plurality of pores.

12 . The capacitor according to claim 1 , wherein the conductive part extends along the dielectric layer inside the pores.

13 . The capacitor according to claim 1 , wherein the electrical conductive material is a metal material.

14 . The capacitor according to claim 1 , wherein the conductive part is any one of a metal material and a conductive compound.

15 . The capacitor according to claim 14 , wherein the conductive compound contains a metal nitride or a metal oxynitride.

16 . The capacitor according to claim 1 , further comprising a protective layer made of an insulating material covering at least side surface parts of the element main body.

17 . The capacitor according to claim 16 , further comprising a metal film interposed between the protective layer and the conductive part.

Assignees

• Murata Manufacturing Co

Inventors

• Inoue Noriyuki
• Hattori Kazuo
• Saeki Hiromasa

Classifications

• H01G9/07

  Dielectric layers · CPC title

• H01G9/0425

  specially adapted for cathode · CPC title

• H01G9/012

  specially adapted for solid capacitors · CPC title

• H01G9/15

  Solid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G4/33

  Thin- or thick-film capacitors {(thin- or thick-film circuits; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor)} · CPC title