| CPC F24C 7/083 (2013.01) [F24C 7/067 (2013.01); H05B 3/74 (2013.01); H05B 3/748 (2013.01); H05B 2203/003 (2013.01); H05B 2203/007 (2013.01)] | 12 Claims |
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1. An electric heater, comprising:
a substrate;
a first plane heating element disposed on one surface of the substrate, the first plane heating element including:
a first electrode portion;
a first track extending from the first electrode portion;
a second track outwardly spaced apart from the first track;
a third track outwardly spaced apart from the second track, wherein at least a portion of the second track is located between the first track and the third track;
a first bridge configured to connect one end of the first track and one end of the second track; and
an inner protrusion protruding towards a center of the first plane beating element; and
a second plane heating element disposed on an inner side of the first plane heating element and inwardly spaced apart from the first plane heating element, the second plane heating element including:
a plurality of inner tracks which become smaller in length as a distance between an inner track and the first plane heating element increases;
a second electrode portion connected to an inner track of the plurality of inner tracks, which is located at an outermost side of the second plane heating element; and
a plurality of inner bridges to connect ends of adjacent inner tracks among the plurality of inner tracks,
wherein a width of each track of the first plane heating element or a width of each track of the second plane heating element is configured to be larger than a gap of adjacent tracks,
wherein the first electrode portion is located between the second electrode portion and the second bridge.
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