A heater mounted on a substrate having a hole penetrating through the substrate.

摘要

A heater comprising a plate shaped substrate 21, which has a hole 23 penetrating through the substrate 21 . The heater has a heating film 25 mounted on the surface of the substrate 21 for generating heat. The film is made of electrically conductive material and formed into a stripe-shape having a first end and a second end. The first end is located near the hole 23. The heater has also a end film 27 coated on the surface of the heating film 25, around the hole 23 and electrically connected with the heating film 25 for supplying electric power to the heating film 25 . The end film 27 has higher electrical conductivity than the heating film 25 . The substrate 21 has means provided at the hole 23 for supplying the electric power to the end film 27 . The hole 23 enables high reliability in electrical connection between the outer terminal and the heater because of the hole 23 and the electric power supply means at the hole 23. <IMAGE>