PLANAR HEATING ELEMENT

To provide a planar heating element capable of improving the efficiency of temperature control.SOLUTION: A planar heating element includes an insulating sheet having a first surface and a second surface that is the back surface thereof, a positive temperature coefficient (PTC) element provided on the first surface, and an electrode provided on the second surface, and the PTC element is provided on the first surface so as to surround the outer circumferential portion of the first surface, and is connected in series with the electrode, and the electrode is provided on the second surface such that a part of the electrode overlaps with the position of the PTC element in the first surface.SELECTED DRAWING: Figure 3 【課題】温度制御の効率を向上させることができる面状発熱体を提供すること。【解決手段】面状発熱体は、第１面と、その裏面である第２面とを備えた絶縁シートと、前記第１面に設けられたＰＴＣ（Positive Temperature Coefficient）素子と、前記第２面に設けられた電極と、を有し、前記ＰＴＣ素子は、前記第１面の外周部分を取り囲むように前記第１面に設けられているとともに、前記電極と直列に接続されており、前記電極は、その一部分が前記第１面における前記ＰＴＣ素子の位置と重なるように前記第２面に設けられている。【選択図】図３