| 摘要 |
<p>PURPOSE:To lessen variation of the resistance value under service by covering the surface of a thin resistance film, which is formed on an insulated base board with certain patterns, with a protection layer of glass type followed by fusion welding, and then baking the thin resistance film. CONSTITUTION:The surface of a thin resistance film 2 formed on an insulated base board 1 with certain patterns is covered with a protection layer 3 of glass type and fusion welded to the film 2, which is then baked. Thus the resistance element is prevented from oxidation due to atmosphere used by means of fusion welding of the protection layer 3 to the resistance film 2, and change in the resistance value under service is suppressed, and baking of the resistance film 2 can promote its recrystallization before the use as a heater. This can suppress change in the resistance value under service.</p> |
