Ceramic heater having a resistance heater element
AssigneeNGK Insulators, Ltd.
InventorHisakazu Okajima
Life of this patent
Estimating the term…
Abstract
A heater is provided including a plate having a heating surface for heating an object to be heated and a resistance heater element provided in the plate. This resistance heater element includes a continuous wiring pattern including a plurality of flexures and a thermal uniform pattern part which improves thermal uniformity. The continuous wiring pattern includes a plurality of folding parts as the flexures. A first distance between the wirings in a first region of the wiring pattern other than a second region proximate the folding parts is substantially constant, and a second distance between the wirings in the second region is greater than the first distance.
Claims14
A heater comprising:
- a plate including a heating surface which heats an object to be heated;
- and
- a resistance heater element provided in said plate, said resistance heater element comprising a continuous wiring pattern including a plurality of flexures, and a uniform thermal pattern portion, wherein an area between immediately radially adjacent outer corners of immediately radially adjacent flexures is varied to improve thermal uniformity between said adjacent flexures.
A heater comprising:
- a plate including a heating surface for heating an object to be heated;
- and
- a resistance heater element provided in said plate, said resistance heater element comprising a continuous wiring pattern including a plurality of radially sequential wirings having a plurality of radially adjacent folding parts, said folding parts having substantially rounded outer corners and a substantially straight connection portion connecting said substantially rounded outer corners of said folding parts;
- wherein a first distance between a portion of one of said wirings before said wiring is folded to form one of said folding parts and an opposed, immediately radially adjacent portion of said wiring after said wiring is folded to form said folding part is substantially constant, and wherein a second distance between a portion of said wiring at one end of said folding part and an opposed, immediately radially adjacent portion of said wiring at the other end of said folding part is greater than said first distance.
A heater comprising:
- a plate including a heating surface for heating an object to be heated;
- and
- a resistance heater element provided in said plate, said resistance heater element comprising a continuous wiring pattern including a plurality of radially sequential wirings having a plurality of radially adjacent folding parts, said folding parts including a substantially linear connection part and outer corners provided at both ends of said linear connection part;
- wherein at least one of said outer corners of said folding parts is substantially rounded and swollen to protrude outwardly;
- and
- wherein a first distance between said radially sequential wirings in a first region of said wiring pattern other than a second region of said wiring pattern proximate said folding parts is substantially constant, and wherein a second distance between said radially sequential wirings in said second region is greater than said first distance.
A heater comprising:
- a plate including a heating surface which heats an object to be heated;
- and
- a resistance heater element provided in said plate, said resistance heater element comprising a wiring pattern including a plurality of concentrically disposed element lines having terminals for input/output of electric power, each said element line including a winding pattern;
- wherein at least one said element line passes between said terminals by means of a flexure;
- and
- wherein said flexure includes a swollen portion having substantially rounded outer corners that curves in an asymptotic direction with respect to at least one of an adjacent portion of said at least one element line and an adjacent portion of another immediately adjacent element line.
Dependencies are inferred from the claim text.