US 11,668,470 B2
Electric heater and cooking appliance having same
Misun Song, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Aug. 21, 2019, as Appl. No. 16/547,153.
Claims priority of application No. 1020180097643 (KR), filed on Aug. 21, 2018.
Prior Publication US 2020/0063977 A1, Feb. 27, 2020
Int. Cl. F24C 7/08 (2006.01); H05B 3/03 (2006.01); F24C 7/06 (2006.01)
CPC F24C 7/083 (2013.01) [F24C 7/067 (2013.01); H05B 3/03 (2013.01); H05B 2203/005 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An electric heater comprising:
a substrate; and
a plane heating element disposed on one surface of the substrate,
wherein the plane heating element includes:
a pattern portion including a start point and an end point, which are located at an outermost side of the pattern portion,
wherein the pattern portion includes:
a plurality of tracks having an arc shape, which are spaced apart from each other and are formed to have a length increasing from an innermost side to the outermost side of the pattern portion, and
a plurality of bridges connecting the plurality of tracks in series,
wherein the plurality of bridges are formed on both sides of the pattern portion with respect to a reference line passing through a center of the pattern portion, and a pair of bridges is a bridge on one side facing a bridge on an other side of the pattern portion, and
wherein, for each two adjacent pairs of bridges, a gap between a pair of bridges and a gap between an adjacent pair of bridges have a width increasing from the innermost side to the outermost side of the pattern portion.