# US 10,480,786 B2 · Heater and glow plug including the same

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- Number: US 10,480,786 B2
- Document ID: US10480786B2
- Status: Granted
- Kind: B2
- Application number: 14/411,195
- Filed: 2013-06-27
- Published: 2015-06-18
- Granted: 2019-11-19
- Earliest claimed: 2012-06-29
- Assignees: KYOCERA Corporation
- Applicants: KYOCERA Corporation
- Inventors: Norimitsu Hiura
- Web page: https://patentgrep.com/patent/US10480786B2

## CPC

- F23Q 7/001: {Glowing plugs for internal-combustion engines}
- H05B 3/12: characterised by the composition or nature of the conductive material
- H05B 3/141: {Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds}
- H05B 3/48: heating conductor embedded in insulating material
- H05B 2203/016: Heaters using particular connecting means
- H05B 2203/027: Heaters specially adapted for glow plug igniters
- F23Q: IGNITION (devices or installations peculiar to internal-combustion engines F02P; of cigarettes or tobacco A24F; compositions therefor, chemical igniters C06C); EXTINGUISHING-DEVICES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A heater of this invention includes an insulating base made of a ceramic, a resistor buried in the insulating base, and leads connected to end portions of the resistor, in which both the resistor and the leads contain electrical conductors and insulating ceramic particles dispersed in the electrical conductors and the insulating ceramic particles contained in the resistor are smaller than the insulating ceramic particles contained in the leads.

## Claims

### Claim 1

A heater, comprising:
an electrically insulating base made of at least one of a ceramic material;
a resistor buried in the electrically insulating base; and
a lead connected to the resistor;
wherein the resistor contains a first set of electrically insulating ceramic particles, and the lead contains a second set of electrically insulating ceramic particles,
wherein an average particle diameter of the first set of electrically insulating ceramic particles is smaller than an average particle diameter of the second set of electrically insulating ceramic particles, and
the first set of electrically insulating ceramic particles and the second set of electrically insulating ceramic particles are both made of the same material as at least one of the ceramic material forming the electrically insulating base.

### Claim 2 (depends on 1)

The heater according to claim 1, wherein the first set of electrically insulating ceramic particles and the second set of electrically insulating ceramic particles are formed of non-spherical particles and a length of a major axis of the first set of electrically insulating ceramic particles is shorter than a length of a major axis of the second set of electrically insulating ceramic particles.

### Claim 3 (depends on 1)

The heater according to claim 1, wherein the lead is connected to an end portion of the resistor in such a manner as to wrap the end portion of the resistor.

### Claim 4 (depends on 1)

A glow plug, comprising:
the heater according to claim 1; and
a metal holding member which is electrically connected to the lead and holds the heater.

### Claim 5 (depends on 1)

The heater according to claim 1, wherein the average particle diameter of the first set of electrically insulating ceramic particles is between 20% and 90% of the average particle diameter of the second set of electrically insulating ceramic particles.

### Claim 6 (depends on 1)

The heater according to claim 1, wherein the average particle diameter of the first set of electrically insulating ceramic particles is between 50% and 70% of the average particle diameter of the second set of electrically insulating ceramic particles.

### Claim 7 (depends on 1)

The heater according to claim 1, wherein the resistor contains a first set of electrical conductors mixed with the first set of electrically insulating ceramic particles, and the leads contain a second set of electrical conductors mixed with the second set of electrically insulating ceramic particles.