# US 2019/0172640 A1 · Ceramic capacitor and manufacturing method thereof

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- Number: US 2019/0172640 A1
- Document ID: US20190172640A1
- Status: Published application
- Kind: A1
- Application number: 16/198,162
- Filed: 2018-11-21
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Taiyo Yuden Co., Ltd.
- Applicants: Taiyo Yuden Co., Ltd.
- Inventors: Yasuyuki INOMATA
- Web page: https://patentgrep.com/patent/US20190172640A1

## CPC

- H01G 4/1227: {based on alkaline earth titanates}
- H01G 4/30: Stacked capacitors (H01G4/33 takes precedence)
- H01G 4/012: Form of non-self-supporting electrodes
- H01G 4/224: Housing; Encapsulation
- H01G 4/248: the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence)
- 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

A ceramic capacitor includes: a dielectric layer of which a main component is a ceramic grain, wherein one or more pores are formed inside of the ceramic grains; and wherein an area ratio of the one or more pores with respect to a cross section of the ceramic grain is 0.03% to 0.20%, in a cross section of the dielectric layer.

## Claims

### Claim 1

A ceramic capacitor comprising:
a dielectric layer of which a main component is a ceramic grain,
wherein one or more pores are formed inside of the ceramic grains; and
wherein an area ratio of the one or more pores with respect to a cross section of the ceramic grain is 0.03% to 0.20%, in a cross section of the dielectric layer.

### Claim 2 (depends on 1)

The ceramic capacitor as claimed in claim 1, wherein the dielectric layer includes a first ceramic grain including a pore inside thereof and a second ceramic grain not including a pore.

### Claim 3 (depends on 2)

The ceramic capacitor as claimed in claim 2, wherein a ratio of the first ceramic grain is 10 vol % or more and 80 vol % or less, when a total of the first ceramic grain and the second ceramic grain in the dielectric layer is 100 vol %.

### Claim 4 (depends on 1)

The ceramic capacitor as claimed in claim 1, wherein the main component is barium titanate.

### Claim 5

A manufacturing method of a ceramic capacitor comprising:
forming a green sheet by using ceramic slurry including a first ceramic powder formed by a hydrothermal synthesis method and a second ceramic powder formed by a method other than the hydrothermal synthesis method; and
firing the green sheet.

### Claim 6 (depends on 5)

The method as claimed in claim 5, wherein the ceramic slurry in which 10 vol % to 80 vol % of the first ceramic powder and 20 vol % to 90 vol % of the second ceramic powder are mixed is used in the forming, when the total of the first ceramic powder and the second ceramic powder is 100 vol %.

### Claim 7 (depends on 5)

The method as claimed in claim 5, wherein the second ceramic powder is formed by using a solid-phase synthesis method, in the forming.

### Claim 8 (depends on 5)

The method as claimed in claim 5, wherein the first ceramic powder and the second ceramic powder are barium tittanate.