Coil assembly

Abstract

A coil assembly is disclosed. The coil assembly comprises a plurality of heating portions disposed on a substrate. The plurality of heating portions are formed in a rotating pattern and electrically connected to each other through at least two layers. The pattern of the plurality of heating portions forms a plurality of spirals in one layer, inter-spiral regions are formed between the plurality of spirals, and at least one sensing coil is disposed in the inter-spiral regions of the other layer. Accordingly, a space for a plurality of sensing coils and a temperature sensor may be ensured.