Ceramic heater

Patent metadata

Field	Value
Publication number	US-9668302-B2
Application number	US-201214008793-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Mar 31, 2011
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A ceramic base body, which is a ceramic heater which suppresses noise radiation and thus has little adverse effect on surrounding electronic devices, includes a plurality of ceramic layers, and a mixed-material layer disposed between two ceramic layers, the mixed-material layer being formed of a mixture of a ceramic material and a metal material. Between the ceramic layer and the mixed-material layer, a heat-generating resistor which generates heat by a passage of electric current therethrough is disposed. Radiation of a high-frequency component generated by the passage of electric current through the heat-generating resistor is suppressed by the mixed-material layer, wherefore the adverse effect of the radiation on surrounding electronic devices can be reduced.

First claim

What is claimed is:

1. A ceramic heater, comprising:
a ceramic base body comprising a ceramic material;
a heat-generating resistor disposed in an interior of the ceramic base body, the heat-generating resistor generating heat by a passage of electric current therethrough; and
a mixed-material layer disposed in the interior of the ceramic base body, the mixed-material layer consisting of a mixture of the ceramic material and a concentration of metal material within the ceramic material,
wherein the mixed-material layer is disposed between the heat-generating resistor and a heating surface of the ceramic base body, and
the mixed-material layer is configured so that the concentration of metal material decreases gradually with respect to an increase in a distance from the heat-generating resistor.

2. The ceramic heater according to claim 1 , wherein the heat-generating resistor comprises a main surface opposed to the heating surface of the ceramic base body, and a side surface contiguous to the main surface,
and wherein the mixed-material layer is disposed so as to cover the main surface and the side surface of the heat-generating resistor.

3. The ceramic heater according to claim 1 , wherein the mixed-material layer is disposed so as to entirely cover the heat-generating resistor.

4. The ceramic heater according to claim 2 , wherein the mixed-material layer is configured so that a thickness of a part thereof which covers the main surface of the heat-generating resistor opposed to the heating surface of the ceramic base body is larger than a thickness of a residual part of the mixed-material layer.

5. The ceramic heater according to claim 3 , wherein the heat-generating resistor comprises a main surface opposed to the heating surface of the ceramic base body,
and wherein the mixed-material layer is configured so that a thickness of a part thereof which covers the main surface of the heat-generating resistor opposed to the heating surface of the ceramic base body is larger than a thickness of a residual part of the mixed-material layer.

6. The ceramic heater according to claim 1 , wherein the metal material is rhenium.

Assignees

• Kamitani Satoru
• Kyocera Corp

Inventors

• Kamitani Satoru

Classifications

• H05B3/16 Primary

  the conductor being mounted on an insulating base · CPC title

• H05B3/48 Primary

  heating conductor embedded in insulating material · CPC title

• H05B3/10 Primary

  Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor · CPC title