Patent ID: 11867410
Assignee: LG ELECTRONICS INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  H | IPC A  F  H

Claim 16:
17. A cooking appliance comprising:
a case forming an outer appearance;
a display;
an input unit;
a power supply;
an electric heater provided on the case; and
a controller for controlling the electric heater, the power supply, and the display according to an input from the input unit, wherein
the electric heater includes:
a substrate;
a first plane heating element disposed on one surface of the substrate;
a second plane heating element disposed on the one surface of the substrate so as to be located outside the first plane heating element, and
a third plane heating element disposed on the one surface of the substrate so as to be located outside the second plane heating element,
wherein the first plane heating element includes:
a first heating unit including a start point and an end point, and disposed on a first zone, the start point and the end point of the first heating unit disposed at same distance from a center of the first zone, and
a pair of first electrode portions connected to the respective start point and end point of the first heating unit, the pair of first electrode portions disposed outside the first zone,

wherein the second plane heating element includes:
a second heating unit that surrounds a portion of an outer circumference of the first heating unit, to the second heating unit including a start point and an end point, the start point and the end point of the second heating unit disposed at same distance from a center of the first zone, and having an opening portion at one side thereof; and
a pair of second electrode portions connected to the respective start point and end point of the second heating unit, the pair of second electrode portions disposed outside the first zone; and

wherein the third plane heating element includes:
a third heating unit that surrounds a portion of an outer circumference of the second heating unit, the third heating unit including a start point and an end point, and having an opening portion in the same direction as the direction of the opening portion of the second heating unit; and
a pair of third electrode portions connected to the respective start point and end point of the third heating unit.