US 11,768,169 B2 · Ceramic heater, sensor element, and gas sensor

Abstract

A heater section includes a plate-like ceramic body (a first substrate layer 1, a second substrate layer 2, and a third substrate layer 3) having a longitudinal direction (front-rear direction) and a short-length direction (left-right direction), and a heater 72 disposed within the plate-like ceramic body and including a lead section 79 and a heating section 76 connected to the lead section 79. The heating section 76 includes a straight portion 78 extending along the longitudinal direction, and a lead side curved portion 77b connected to one of the ends of the straight portion 78 closer to the lead section 79. The lead side curved portion 77b has a lower resistance per unit length than the straight portion 78 at one or more temperatures in the range of 700° C. to 900° C.

Claims20

Dependent claims

A ceramic heater comprising:

a plate-like ceramic body having a longitudinal direction and a short-length direction;
and
a heating element disposed within the plate-like ceramic body, the heating element including a lead section and a heating section connected to the lead section,
wherein the heating section includes a straight portion whose length direction is along the longitudinal direction and at least one lead side curved portion connected to one of the ends of the straight portion closer to the lead section, and wherein the closest to the lead section of the at least one lead side curved portion has a lower resistance per unit length than the straight portion at one or more temperatures in the range of 700° C. to 900° C.,
wherein the heating section is formed of a material comprising a noble metal, and
wherein the straight portion has a same cross sectional area at any position.

3 more elements

Dependencies are inferred from the claim text.

Ceramic heater, sensor element, and gas sensor

Life of this patent

Ceramic heater, sensor element, and gas sensor

Life of this patent

Abstract

Claims20