Patent ID: 6455823
Filing Date: 2002-09-24
Classification: H05B

Abstract:
An electrical heater, comprising:a substrate; a plurality of first, second and third electrodes disposed on the substrate in spaced apart relation; the second electrode located between the first and third electrodes; the first, second and third electrodes each having opposite end portions located at a common termination zone of the substrate; a thermistor material electrically interconnecting the first, second and third electrodes; adjacent portions of the first, second and third electrodes arranged in a generally serpentine pattern on the substrate; a summation of electrical paths along the first and third electrodes from one of the corresponding end portions thereof to adjacent portions of the first and third electrodes is substantially the same; a summation of electrical paths along the first and second electrodes from one of the corresponding end portions thereof to adjacent portions of the first and second electrodes is substantially the same; and a summation of electrical paths along the second and third electrodes from one of the corresponding end portions thereof to adjacent portions of the second and third electrodes is substantially the same.