Patent ID: 6542066
Filing Date: 2003-04-01
Classification: H01C

Abstract:
An electrical device comprising(1) a pair of electrodes; (2) three substrates which are integrally bonded to one inner surface of a back plate, the two outermost substrates having a metal layer on an inner surface, and the center substrate having metal layers on both surfaces; and (3) PTC elements (a) inserted between the substrates, (b) each PTC element having metal layers on both surfaces, one metal layer of each PTC element facing and in electrical contact with the inner metal layers of an adjacent outermost substrate and a second metal layer of each PTC element facing and in electrical contact with a metal layer of the center substrate, and (c) all being connected in parallel with the electrodes; the metal layers on the inner surfaces of the two outer substrates being electrically connected by an electrode formed on the outer surfaces of said outer substrates and the outer surface of the back plate, and the metal layers formed on both surfaces of the center substrate being electrically connected by an electrode formed at least in a through-hole provided on the back plate and on the outer surface of the back plate.